Maxim-integrated MAXQ Family Users Guide: MAXQ2000 Supplement Manual de usuario descargar pdf (Pagina 52)

MAXQ Family User’s Guide:

MAXQ2000 Supplement

ADDENDUM TO SECTION 11: SERIAL PERIPHERAL INTERFACE (SPI)

The MAXQ2000 provides a Serial Peripheral Interface (SPI) module, which operates as described in the MAXQ Family User’s Guide.

Table 17 shows the associated pins and Table 18 shows the associated registers for this interface.

SPI Example: Enabling Master Mode

move SPICN, #03h ; Enable SPI for master mode communication

move SPICF, #00h ; Rising clock, active edge sample, 8-bit character

move SPICK, #010h ; Divide by 16 clock

PIN NUMBER

SPI INTERFACE FUNCTION

68-PIN 56-PIN

MULTIPLEXED WITH PORT PIN

Slave Select—SSEL 38 — P5.4

Slave Clock—SCLK 40 — P5.6

Master Out-Slave In—MOSI 39 — P5.5

Master In-Slave Out—MISO 41 — P5.7

Table 17. SPI Input and Output Pins

SPICN M3[15h]

SPI Control Register. Enable, master/slave mode select, status, and interrupt flags.

SPICF M3[16h]

SPI Configuration Register. Clock polarity/phase, character length, interrupt enable.

SPICK M3[17h]

SPI Clock Register. Master baud rate = 0.5 x sysClock / (SPICK + 1)

SPIB M3[05h] SPI Data Buffer. Writes go to SPI write buffer; reads come from SPI read buffer.

Table 18. SPI Interface Control Registers

Maxim Integrated

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 92 93

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Maxim-integrated MAXQ Family Users Guide: MAXQ2000 Supplement Manual de usuario Pagina 52